All / Asian / Chrysler / European / Ford / GM. Automotive technician members of iATN have posted over 389 automotive repair related questions in the month of March, resulting in over 2586 responses. iATN members may view the full text of each day's Q&A from the links below, and premium subscribers may search the entire knowledge base. Aug 13, 2020 · P0456 JEEP Description The Evaporative emissions system is design to prevent the escape of fuel vapors from the fuel system. Leaks in the system, ca allow vapors to escape into the atmosphere. The leak detection system tests for EVAP system leaks and blockage. Aug 02, 2020 · You should know that this code doesn’t affect the performance of the engine. This means that you can drive the car with the P0456 code. However, this won’t be completely safe. The code indicates that there’s a leak that lets the toxic fumes escape into the air causing air pollution every time you fill the tank with fuel. Dec 28, 2018 · P0455, P0456 code on Jeep, Dodge What causes P0455, P0456 code on Jeep, Dodge. Chrysler has issued service bulletin 25-002-15 REV. B to address a P0455, P0456 code on Jeep, Dodge vehicles listed below. The check engine light on these vehicles can illuminate and when scanned, reveal P0455, P0456 codes. P0455 EVAP System Large Leak